Feedback-based transmission property adjustment in sidelink communications

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmission-adjusting wireless node may transmit a first communication via a sidelink channel. The transmission-adjusting wireless node may receive, from a feedback-reporting wireless node, transmission-specific information relating to at least one of a channel quality of the sidelink channel or a power level for the transmission-adjusting wireless node. The transmission-specific information may be based at least in part on the first communication. The transmission-adjusting wireless node may adjust, based at least in part on the transmission-specific information, a transmission property of the transmission-adjusting wireless node to obtain an adjusted transmission property. The transmission-adjusting wireless node may transmit a second communication via the sidelink channel using the adjusted transmission property. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This Patent Application claims priority to U.S. Provisional PatentApplication No. 62/877,187, filed on Jul. 22, 2019, entitled“FEEDBACK-BASED TRANSMISSION PROPERTY ADJUSTMENT IN SIDELINKCOMMUNICATIONS,” and assigned to the assignee hereof. The disclosure ofthe prior Application is considered part of and is incorporated byreference in this Patent Application.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for transmissionproperty adjustment in sidelink communications.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, further improvements in LTE and NR technologies remain useful.Preferably, these improvements should be applicable to other multipleaccess technologies and the telecommunication standards that employthese technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by atransmission-adjusting wireless node, may include transmitting a firstcommunication via a sidelink channel; receiving, from afeedback-reporting wireless node, transmission-specific informationrelating to at least one of a channel quality of the sidelink channel ora power level for the transmission-adjusting wireless node, wherein thetransmission-specific information is based at least in part on the firstcommunication; adjusting, based at least in part on thetransmission-specific information, a transmission property of thetransmission-adjusting wireless node to obtain an adjusted transmissionproperty; and transmitting a second communication via the sidelinkchannel using the adjusted transmission property.

In some aspects, a transmission-adjusting wireless node for wirelesscommunication may include memory and one or more processors coupled tothe memory. The memory and the one or more processors may be configuredto transmit a first communication via a sidelink channel; receive, froma feedback-reporting wireless node, transmission-specific informationrelating to at least one of a channel quality of the sidelink channel ora power level for the transmission-adjusting wireless node, wherein thetransmission-specific information is based at least in part on the firstcommunication; adjust, based at least in part on thetransmission-specific information, a transmission property of thetransmission-adjusting wireless node to obtain an adjusted transmissionproperty; and transmit a second communication via the sidelink channelusing the adjusted transmission property.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of atransmission-adjusting wireless node, may cause the one or moreprocessors to transmit a first communication via a sidelink channel;receive, from a feedback-reporting wireless node, transmission-specificinformation relating to at least one of a channel quality of thesidelink channel or a power level for the transmission-adjustingwireless node, wherein the transmission-specific information is based atleast in part on the first communication; adjust, based at least in parton the transmission-specific information, a transmission property of thetransmission-adjusting wireless node to obtain an adjusted transmissionproperty; and transmit a second communication via the sidelink channelusing the adjusted transmission property.

In some aspects, an apparatus for wireless communication may includemeans for transmitting a first communication via a sidelink channel;means for receiving, from a wireless node, transmission-specificinformation relating to at least one of a channel quality of thesidelink channel or a power level for the apparatus, wherein thetransmission-specific information is based at least in part on the firstcommunication; means for adjusting, based at least in part on thetransmission-specific information, a transmission property of theapparatus to obtain an adjusted transmission property; and means fortransmitting a second communication via the sidelink channel using theadjusted transmission property.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a UE in a wireless communication network,in accordance with various aspects of the present disclosure.

FIG. 3 is a block diagram illustrating an example of communications viaa sidelink, in accordance with various aspects of the presentdisclosure.

FIG. 4 is a diagram illustrating an example of transmission propertyadjustment in sidelink communications, in accordance with variousaspects of the present disclosure.

FIG. 5 is a diagram illustrating an example process performed, forexample, by a wireless node, in accordance with various aspects of thepresent disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. A BS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). A BS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 aand aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,and/or the like. A frequency may also be referred to as a carrier, afrequency channel, and/or the like. Each frequency may support a singleRAT in a given geographic area in order to avoid interference betweenwireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with transmission property adjustment insidelink communications, as described in more detail elsewhere herein.For example, controller/processor 240 of base station 110,controller/processor 280 of UE 120, and/or any other component(s) ofFIG. 2 may perform or direct operations of, for example, process 400 ofFIG. 4, and/or other processes as described herein. Memories 242 and 282may store data and program codes for base station 110 and UE 120,respectively. In some aspects, memory 242 and/or memory 282 may comprisea non-transitory computer-readable medium storing one or moreinstructions for wireless communication. For example, the one or moreinstructions, when executed by one or more processors of the basestation 110 and/or the UE 120, may cause the one or more processors toperform the method described in greater detail with reference to FIGS. 4and 5. A scheduler 246 may schedule UEs for data transmission on thedownlink and/or uplink.

In some aspects, UE 120 may include means for transmitting acommunication via a sidelink channel (e.g., using controller/processor280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna252, and/or the like), means for receiving transmission-specificinformation relating to at least one of a channel quality of thesidelink channel or a power level (e.g., using antenna 252, DEMOD 254,MIMO detector 256, receive processor 258, controller/processor 280,memory 282, and/or the like), means for adjusting, based at least inpart on the transmission-specific information, a transmission propertyof the apparatus to obtain an adjusted transmission property (e.g.,using receive processor 258, controller/processor 280, memory 282,and/or the like), means for transmitting a communication via thesidelink channel using the adjusted transmission property (e.g., usingcontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, and/or the like), and/or the like. In someaspects, such means may include one or more components of UE 120described in connection with FIG. 2, such as controller/processor 280,transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252,DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2.

FIG. 3 is a block diagram conceptually illustrating an example 300 ofcommunications via a sidelink, in accordance with certain aspects of thepresent disclosure.

As shown in FIG. 3, a first UE 305-1 may communicate with a second UE305-2 (and one or more other UEs 305) using device-to-device (D2D)communications via one or more sidelink channels 310. In some aspects,the UEs 305 may correspond to one or more other UEs described elsewhereherein, such as UE 120 and/or the like. In some aspects, the sidelinkchannel 310 may use a PC5 interface and/or may operate in a highfrequency band (e.g., the 5.9 GHz band). Additionally, or alternatively,the UEs 305 may synchronize timing of transmission time intervals (e.g.,frames, subframes, slots, and/or the like) using global navigationsatellite system (GNSS) timing. The UEs 305 may transmit communications(e.g., one-to-many broadcasts and/or multicast transmissions) using thesidelink channel 310.

As further shown in FIG. 3, the sidelink channel 310 may include aphysical sidelink control channel (PSCCH) 315 and a physical sidelinkshared channel (PSSCH) 320. The PSCCH 315 may be used to communicatecontrol information, similar to a physical downlink control channel(PDCCH) and/or a physical uplink control channel (PUCCH) used forcommunications with a base station 110. The PSSCH 320 may be used tocommunicate data, similar to a physical downlink shared channel (PDSCH)and/or a physical uplink shared channel (PUSCH) used for communicationswith a base station 110. For example, the PSCCH 315 may carry sidelinkcontrol information (SCI) 325, which may indicate various controlinformation used for sidelink communications, such as one or moreresources (e.g., time and/or frequency resources) where a transportblock (TB) 330 that includes data is carried on the PSSCH 320. In somecases, the TB 330 may include vehicle-to-everything (V2X) data, such asa basic safety message (BSM), a traffic information message (TIM), asignal phase and time (SPAT) message, a MAP message to convey geographicroad information, a cooperative awareness message (CAM), a distributedenvironment notification message (DENM), an in-vehicle information (IVI)message, and/or the like.

In some aspects, the sidelink channel 310 may use resource pools. Forexample, a scheduling assignment (e.g., included in SCI 325) may betransmitted in sub-channels using specific resource blocks (RBs) acrosstime. In some aspects, data transmissions (e.g., on the PSSCH 320)associated with a scheduling assignment may occupy adjacent RBs in thesame subframe as the scheduling assignment (e.g., using frequencydivision multiplexing). In some aspects, a scheduling assignment andassociated data transmissions are not transmitted on adjacent RBs.

In some aspects, a UE 305 (either UE 305-1 or UE 305-2) may operateusing transmission mode 4, where resource selection and/or scheduling isperformed by the UE 305 (e.g., rather than a base station 110). In someaspects, the UE 305 may perform resource selection and/or scheduling bysensing channel availability for transmissions. For example, the UE 305may measure a received signal strength indicator (RSSI) parameter (e.g.,a sidelink-RSSI (S-RSSI) parameter) associated with various sidelinkchannels, may measure a reference signal received power (RSRP) parameter(e.g., a PSSCH-RSRP parameter) associated with various sidelinkchannels, may measure a reference signal received quality (RSRQ)parameter (e.g., a PSSCH-RSRQ parameter) associated with varioussidelink channels, and/or the like, and may select a channel fortransmission of communications based at least in part on themeasurement(s).

Additionally, or alternatively, the UE 305 may perform resourceselection and/or scheduling using SCI 325 received in the PSCCH 315,which may indicate occupied resources, channel parameters, and/or thelike. Additionally, or alternatively, the UE 305 may perform resourceselection and/or scheduling by determining a channel busy rate (CBR)associated with various sidelink channels, which may be used for ratecontrol (e.g., by indicating a maximum number of resource blocks thatthe UE 305 can use for a particular set of subframes).

In transmission mode 4, a UE 305 may generate sidelink grants, and maytransmit the grants in SCI 325. A sidelink grant may indicate, forexample, one or more parameters (e.g., transmission parameters) to beused for an upcoming transmission, such as one or more resource blocksto be used for the upcoming transmission on the PSSCH 320 (e.g., for TBs330), one or more subframes to be used for the upcoming transmission, amodulation and coding scheme (MCS) to be used for the upcomingtransmission, and/or the like. In some aspects, a UE 305 may generate asidelink grant that indicates one or more parameters for semi-persistentscheduling (SPS), such as a periodicity of a transmission (e.g., aperiodic V2X message, such as a safety message and/or the like).Additionally, or alternatively, the UE 305 may generate a sidelink grantfor event-driven scheduling, such as for an on-demand message.

In sidelink communications, conditions of the sidelink channel 310 usedto carry the communications may vary widely and change quickly due tothe high mobility of the UEs 305 (e.g., UEs associated with vehicles),large variations in UE activity at different times of day and indifferent locations, a wide variety of topographies that the UEs 305 maytraverse (e.g., dense urban environments, hilly environments, flatenvironments, and/or the like), and/or the like. As a result, a transmitpower used by a UE 305 in sidelink communications may need frequentadjustment in order to compensate for the varying conditions of thesidelink channel 310. However, current power control procedures (e.g.,used in systems in which the UEs 305 may use a base station 110 as anintermediary to communicate) are performed infrequently, based at leastin part on an assumption of a stationary transmitter (e.g., a stationarybase station 110), and use time-averaged measurements of channel qualityfor determining transmit power. Accordingly, current power controlprocedures may result in unreliable sidelink communications. Sometechniques and apparatuses described herein improve performance ofsidelink communications using dynamic transmission property adjustmentbased at least in part on channel quality-based feedback signaledbetween the UEs 305.

As indicated above, FIG. 3 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 3.

FIG. 4 is a diagram illustrating an example 400 of transmission propertyadjustment in sidelink communications, in accordance with variousaspects of the present disclosure. As shown in FIG. 4, atransmission-adjusting wireless node 405-1 may communicate with afeedback-reporting wireless node 405-2 (and one or more other wirelessnodes 405) via one or more sidelink channels (e.g., sidelink channels310). In some aspects, wireless node 405-1 and wireless node 405-2 bothmay be transmission-adjusting wireless nodes and feedback-reportingwireless nodes at the same time or at different times.

In some aspects, the wireless nodes 405 may correspond to one or moreUEs described elsewhere herein (e.g., UE 120, UE 305, and/or the like)and/or integrated access backhaul (IAB) nodes. For example, the wirelessnodes 405 both may be UEs or both may be IAB nodes. As another example,one wireless node 405 may be a UE and the other wireless node 405 may bean IAB node. In some aspects, a wireless node 405 may be associated witha vehicle (e.g., may be integrated into the vehicle, may be located inor on the vehicle, and/or the like). The vehicle may include anautonomous vehicle, a semi-autonomous vehicle, a non-autonomous vehicle,and/or the like. In some aspects, a wireless node 405 may be associatedwith infrastructure (e.g., traffic infrastructure), such as a trafficsignal, a lane signal, a sensor, a traffic controller system, and/or thelike.

As shown by reference number 410, the transmission-adjusting wirelessnode 405-1 may transmit a communication or transmission to thefeedback-reporting wireless node 405-2 via a sidelink channel. Forexample, the communication or transmission may be a data communicationtransmitted from the transmission-adjusting wireless node 405-1 to thefeedback-reporting wireless node 405-2 on a PSSCH 320. In some aspects,the transmission-adjusting wireless node 405-1 also may transmit a powerheadroom report (PHR) to the feedback-reporting wireless node 405-2 viathe sidelink channel. In such a case, the transmission-adjustingwireless node 405-1 may transmit the PHR to the feedback-reportingwireless node 405-2 on a PSCCH 315. For example, the PHR may be includedin SCI 325 transmitted from the transmission-adjusting wireless node405-1 to the feedback-reporting wireless node 405-2.

The PHR may provide information relating to a power headroom of thetransmission-adjusting wireless node 405-1. The power headroom mayrepresent a difference of a maximum transmit power of thetransmission-adjusting wireless node 405-1 and a transmit power used bythe transmission-adjusting wireless node 405-1 for transmitting thecommunication. In some aspects, the maximum transmit power may be amaximum transmit power at which the transmission-adjusting wireless node405-1 is capable of transmitting. Alternatively, the maximum transmitpower may be a maximum transmit power at which thetransmission-adjusting wireless node 405-1 is permitted to transmit. Forexample, the maximum transmit power may be a maximum transmit power atwhich the transmission-adjusting wireless node 405-1 can transmitwithout exceeding an interference threshold for an access link to a basestation 110 serving the transmission-adjusting wireless node 405-1.

As shown by reference number 415, the feedback-reporting wireless node405-2 may receive the communication from the transmission-adjustingwireless node 405-1 and determine, based at least in part on thecommunication, information relating to at least one of a channel qualityof the sidelink channel or a power level for the transmission-adjustingwireless node 405-1. For example, the feedback-reporting wireless node405-2 may determine an instantaneous channel quality or power levelbased at least in part on the communication. Accordingly, theinformation relating to the at least one of channel quality or powerlevel may be transmission specific (e.g., specific to the communicationor transmission from the transmission-adjusting wireless node 405-1).

In some aspects, the information relating to channel quality may be aCQI for the sidelink channel. For example, the feedback-reportingwireless node 405-2 may compute a CQI for the sidelink channel based atleast in part on the communication or transmission received from thetransmission-adjusting wireless node 405-1 (e.g., based at least in parton a signal-to-noise ratio of the communication, asignal-to-interference plus noise ratio of the communication, asignal-to-noise plus distortion ratio of the communication, and/or thelike).

In some aspects, the information relating to power level may be atransmit power control (TPC) for the transmission-adjusting wirelessnode 405-1. For example, the feedback-reporting wireless node 405-2 maydetermine a TPC for the transmission-adjusting wireless node 405-1 basedat least in part on the communication and/or based at least in part onthe computed CQI. The TPC may provide an instruction to thetransmission-adjusting wireless node 405-1 to increase transmit power ordecrease transmit power. In some aspects, the TPC may indicate aparticular transmit power that the transmission-adjusting wireless node405-1 is to use, or may indicate a particular degree by which thetransmission-adjusting wireless node 405-1 is to adjust transmit power.In some aspects, the TPC may be based at least in part on a PHR providedby the transmission-adjusting wireless node 405-1. For example, thefeedback-reporting wireless node 405-2 may determine a TPC such that atransmit power adjustment that is to be used by thetransmission-adjusting wireless node 405-1 does not exceed a powerheadroom of the transmission-adjusting wireless node 405-1 (e.g., apower headroom indicated by a PHR).

In some aspects, the feedback-reporting wireless node 405-2 maydetermine a transmission property that the transmission-adjustingwireless node 405-1 is to adjust based at least in part on thecommunication and the PHR provided by the transmission-adjustingwireless node 405-1. In such a case, if the CQI for the communication isbelow a threshold value (e.g., the communication has poor quality), thefeedback-reporting wireless node 405-2 may determine the transmissionproperty based at least in part on the PHR. For example, if a powerheadroom indicated by the PHR is below a threshold value (e.g., there isinsufficient power headroom), the feedback-reporting wireless node 405-2may determine that the transmission-adjusting wireless node 405-1 is toadjust an MCS (e.g., select an MCS that uses a lower data rate) used bythe transmission-adjusting wireless node 405-1. In some aspects, thefeedback-reporting wireless node 405-2 may select an MCS that thetransmission-adjusting wireless node 405-1 is to use. As anotherexample, if the power headroom is above the threshold value (e.g., thereis sufficient power headroom), the feedback-reporting wireless node405-2 may determine that the transmission-adjusting wireless node 405-1is to adjust a transmit power (e.g., increase transmit power) used bythe transmission-adjusting wireless node 405-1. In such a case, thefeedback-reporting wireless node 405-2 may determine a TPC for thetransmission-adjusting wireless node 405-1 to use when adjusting thetransmit power, as described above. In addition, if the power headroomis above the threshold value, the feedback-reporting wireless node 405-2may additionally, or alternatively, determine that thetransmission-adjusting wireless node 405-1 is to adjust an MCS, asdescribed above.

The feedback-reporting wireless node 405-2 may provide the informationrelating to a computed CQI, a determined TPC, and/or a determinedtransmission property for adjustment to the transmission-adjustingwireless node 405-1. In some aspects, the feedback-reporting wirelessnode 405-2 may provide the information in acknowledgment ornegative-acknowledgment feedback of the communication from thetransmission-adjusting wireless node 405-1. In some aspects, theinformation may include a timestamp or another indication thatassociates the information with the communication from thetransmission-adjusting wireless node 405-1. In this way, the timestampor the other indication enables the transmission-adjusting wireless node405-1 to determine a particular communication of thetransmission-adjusting wireless node 405-1 that is associated with theinformation.

As shown by reference number 420, the transmission-adjusting wirelessnode 405-1 may receive (e.g., in acknowledgment ornegative-acknowledgment feedback from the feedback-reporting wirelessnode 405-2) the information relating to the computed CQI, the determinedTPC, and/or the determined transmission property for adjustment. Asnoted above, the information may be specific to a particularcommunication of the transmission-adjusting wireless node 405-1 (i.e.,transmission-specific, in the illustrated example, communication 410).Accordingly, before using the information, the transmission-adjustingwireless node 405-1 may determine whether the information is associatedwith a recent transmission of the transmission-adjusting wireless node405-1 (e.g., a most recent transmission or a transmission that occurredwithin a threshold time period).

In some aspects, the communication of the transmission-adjustingwireless node 405-1 may be received by a plurality of wireless nodes 405(e.g., the communication may be a broadcast), and thetransmission-adjusting wireless node 405-1 may receive, from each of theplurality of wireless nodes 405, information relating to a channelquality of a sidelink channel and/or a transmit power for thetransmission-adjusting wireless node 405-1. For example, thetransmission-adjusting wireless node 405-1 may receive a plurality ofinformation (e.g., transmission-specific information) relating to achannel quality (e.g., CQI) of a sidelink channel. As another example,the transmission-adjusting wireless node 405-1 may receive a pluralityof information (e.g., transmission-specific information) relating to apower level for the transmission-adjusting wireless node 405-1.

As shown by reference number 425, the transmission-adjusting wirelessnode 405-1 may adjust a transmission property of thetransmission-adjusting wireless node 405-1 (e.g., a transmissionproperty that is to be used for transmissions to the feedback-reportingwireless node 405-2 via the sidelink channel) based at least in part onthe received information relating to channel quality and/or transmitpower. In some aspects, the transmission-adjusting wireless node 405-1may adjust a transmission property for subsequent communications ortransmissions from the transmission-adjusting wireless node 405-1 to thefeedback-reporting wireless node 405-2 based at least in part ontransmission-specific information determined by the feedback-reportingwireless node 405-2. In other words, each acknowledgment ornegative-acknowledgment feedback provided by the feedback-reportingwireless node 405-2 may enable the transmission-adjusting wireless node405-1 to adjust a transmission property that is to be used for thefollowing communication from the transmission-adjusting wireless node405-1 to the feedback-reporting wireless node 405-2. For example, afterreceiving acknowledgment or negative-acknowledgment feedback from thefeedback-reporting wireless node 405-2 that includestransmission-specific information relating to channel quality and/ortransmit power, the transmission-adjusting wireless node 405-1 mayadjust a transmission property for a next communication to thefeedback-reporting wireless node 405-2 based at least in part on thetransmission-specific information. In this way, the adjustedtransmission property, that is to be used by the transmission-adjustingwireless node 405-1 for a communication to the feedback-reportingwireless node 405-2, is also transmission-specific.

In some aspects, the transmission-adjusting wireless node 405-1 mayadjust a transmission property based at least in part on a plurality ofreceived information (e.g., transmission-specific information) relatingto channel quality and/or transmit power (e.g., received from aplurality of wireless nodes 405). In such a case, thetransmission-adjusting wireless node 405-1 may adjust the transmissionproperty based at least in part on a lowest channel quality, a highestchannel quality, a most recurrent channel quality (e.g., a modal channelquality representing a most common value for the channel quality over agiven number of samples), a lowest power level, a highest power level, amost recurrent power level (e.g., a modal power level), and/or the like,indicated in the plurality of received information.

The transmission property adjusted by the transmission-adjustingwireless node 405-1 may be a transmit power and/or an MCS of thetransmission-adjusting wireless node 405-1. In some aspects, thetransmission-adjusting wireless node 405-1 may determine to adjusttransmit power and/or an MCS based at least in part on whether theinformation relating to channel quality (e.g., CQI) satisfies athreshold value. For example, if the determined CQI is below a thresholdvalue (e.g., the channel quality is unsatisfactory), thetransmission-adjusting wireless node 405-1 may increase transmit powerand/or select an MCS that uses a lower data rate. As another example, ifthe determined CQI is above the threshold value (e.g., the channelquality is satisfactory), the transmission-adjusting wireless node 405-1may decrease a transmit power and/or select an MCS that uses a higherdata rate. In such cases, the transmission-adjusting wireless node 405-1may determine a degree by which to adjust transmit power and/or an MCSbased at least in part on a degree by which the CQI is above or belowthe threshold value.

In some aspects, when the CQI is below the threshold value, thetransmission-adjusting wireless node 405-1 may determine to adjusttransmit power (e.g., increase transmit power) and/or an MCS (e.g.,select an MCS that uses a lower data rate) based at least in part onwhether the transmission-adjusting wireless node 405-1 is being servedby a base station 110. For example, the transmission-adjusting wirelessnode 405-1 may determine to adjust an MCS (e.g., select an MCS that usesa lower data rate) based at least in part on a determination thatadjusting a transmit power of the transmission-adjusting wireless node405-1 would cause the transmission-adjusting wireless node 405-1 toexceed an interference threshold for an access link to a base station110. As another example, the transmission-adjusting wireless node 405-1may determine to adjust transmit power (e.g., increase transmit power)based at least in part on a determination that thetransmission-adjusting wireless node 405-1 is out of coverage of a basestation 110. In such a case, the transmission-adjusting wireless node405-1 may determine to adjust transmit power according to a TPCdetermined by the feedback-reporting wireless node 405-2. Moreover, whenthe transmission-adjusting wireless node 405-1 is out of coverage of abase station 110, the transmission-adjusting wireless node 405-1 mayadditionally, or alternatively, adjust an MCS (e.g., select an MCS thatuses a lower data rate).

In some aspects, the transmission-adjusting wireless node 405-1 maydetermine to adjust transmit power and/or an MCS based at least in parton information relating to a determined transmission property foradjustment (e.g., determined by the feedback-reporting wireless node405-2, as described above). For example, if the information indicatesthat the transmission-adjusting wireless node 405-1 is to adjust an MCS,the transmission-adjusting wireless node 405-1 may adjust an MCS that isto be used for transmissions to the feedback-reporting wireless node405-2. In some aspects, the transmission-adjusting wireless node 405-1may select an MCS that is specified in the information. As anotherexample, if the information indicates that the transmission-adjustingwireless node 405-1 is to adjust transmit power, thetransmission-adjusting wireless node 405-1 may adjust a transmit powerthat is to be used for transmissions to the feedback-reporting wirelessnode 405-2. In some aspects, the transmission-adjusting wireless node405-1 may adjust transmit power according to a TPC specified in theinformation.

As shown by reference number 430, the transmission-adjusting wirelessnode 405-1 may transmit a communication to the feedback-reportingwireless node 405-2, via the sidelink channel, using the adjustedtransmission property (e.g., transmit power and/or MCS). For example,the transmission-adjusting wireless node 405-1 may transmit thecommunication to the feedback-reporting wireless node 405-2 using atransmission-specific adjusted transmission property. In such a case,the transmission-specific adjusted transmission property used for thecommunication may be based at least in part on a previous communicationthat immediately preceded the communication. In this way, transmissionsfrom the transmission-adjusting wireless node 405-1 to thefeedback-reporting wireless node 405-2 account for an instantaneouschannel quality between the wireless nodes 405.

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 4.

FIG. 5 is a diagram illustrating an example process 500 performed, forexample, by a wireless node, in accordance with various aspects of thepresent disclosure. Example process 500 is an example where a wirelessnode (e.g., wireless node 405, and/or the like) performs operationsassociated with transmission property adjustment in sidelinkcommunications.

As shown in FIG. 5, in some aspects, process 500 may includetransmitting a first communication via a sidelink channel (block 510).For example, the wireless node (e.g., using transmit processor 264,controller/processor 280, memory 282, and/or the like) may transmit afirst communication via a sidelink channel, as described above, forexample, with reference to FIG. 4.

As further shown in FIG. 5, in some aspects, process 500 may includereceiving transmission-specific information relating to at least one ofa channel quality of the sidelink channel or a power level, wherein thetransmission-specific information is based at least in part on the firstcommunication (block 520). For example, the wireless node (e.g., usingreceive processor 258, controller/processor 280, memory 282, and/or thelike) may receive transmission-specific information relating to at leastone of a channel quality of the sidelink channel or a power level forthe transmission-adjusting wireless node, as described above, forexample, with reference to FIG. 4. In some aspects, thetransmission-specific information is based at least in part on the firstcommunication.

As further shown in FIG. 5, in some aspects, process 500 may includeadjusting, based at least in part on the transmission-specificinformation, a transmission property to obtain an adjusted transmissionproperty (block 530). For example, the wireless node (e.g., usingcontroller/processor 280, memory 282, and/or the like) may adjust, basedat least in part on the transmission-specific information, atransmission property to obtain an adjusted transmission property, asdescribed above.

As further shown in FIG. 5, in some aspects, process 500 may includetransmitting a second communication via the sidelink channel using theadjusted transmission property (block 540). For example, the wirelessnode (e.g., using transmit processor 264, controller/processor 280,memory 282, and/or the like) may transmit a second communication via thesidelink channel using the adjusted transmission property, as describedabove.

Process 500 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the transmission-specific information relates to atleast one of a channel quality indicator of the sidelink channel or atransmit power control. In a second aspect, alone or in combination withthe first aspect, the transmission-specific information is received withacknowledgment or negative-acknowledgment feedback of the firstcommunication. In a third aspect, alone or in combination with one ormore of the first and second aspects, the adjusted transmission propertyis at least one of a modulation and coding scheme or a transmit power.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the adjusted transmission property is amodulation and coding scheme of a transmission-adjusting wireless node,based at least in part on a determination that adjusting a transmitpower of the transmission-adjusting wireless node would cause thetransmission-adjusting wireless node to exceed an interference thresholdfor an access link to a base station serving the transmission-adjustingwireless node. In a fifth aspect, alone or in combination with one ormore of the first through third aspects, the adjusted transmissionproperty is a transmit power of a transmission-adjusting wireless node,based at least in part on a determination that thetransmission-adjusting wireless node is out of coverage of a basestation.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, a plurality of transmission-specific informationrelating to channel quality is received from a plurality offeedback-reporting wireless nodes, and the adjusted transmissionproperty is based at least in part on a lowest channel quality indicatedin the plurality of transmission-specific information. In a seventhaspect, alone or in combination with one or more of the first throughfifth aspects, a plurality of transmission-specific information relatingto channel quality is received from a plurality of feedback-reportingwireless nodes, and the adjusted transmission property is based at leastin part on a most recurrent channel quality indicated in the pluralityof transmission-specific information.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the transmission-specific information isbased at least in part on the first communication and the PHR. In aninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the transmission-specific information indicatesthat a modulation and coding scheme is to be adjusted. In a tenthaspect, alone or in combination with one or more of the first throughninth aspects, the transmission-specific information indicates that atransmit power of the transmission-adjusting wireless node is to beadjusted.

Although FIG. 5 shows example blocks of process 500, in some aspects,process 500 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 5.Additionally, or alternatively, two or more of the blocks of process 500may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by atransmission-adjusting wireless node, comprising: transmitting a firstcommunication via a sidelink channel; receiving, from afeedback-reporting wireless node, transmission-specific informationrelating to at least one of a channel quality of the sidelink channel ora power level for the transmission-adjusting wireless node, wherein thetransmission-specific information is based at least in part on the firstcommunication; adjusting, based at least in part on thetransmission-specific information, a transmission property of thetransmission-adjusting wireless node to obtain an adjusted transmissionproperty; and transmitting a second communication via the sidelinkchannel using the adjusted transmission property.
 2. The method of claim1, wherein the transmission-specific information relates to at least oneof a channel quality indicator of the sidelink channel or a transmitpower control for the transmission-adjusting wireless node.
 3. Themethod of claim 1, wherein the transmission-specific information isreceived with acknowledgment or negative-acknowledgment feedback of thefirst communication from the feedback-reporting wireless node.
 4. Themethod of claim 1, wherein the adjusted transmission property is atleast one of a modulation and coding scheme or a transmit power of thetransmission-adjusting wireless node.
 5. The method of claim 1, whereinthe adjusted transmission property is a modulation and coding scheme ofthe transmission-adjusting wireless node based at least in part on adetermination that adjusting a transmit power of thetransmission-adjusting wireless node would cause thetransmission-adjusting wireless node to exceed an interference thresholdfor an access link to a base station serving the transmission-adjustingwireless node.
 6. The method of claim 1, wherein the adjustedtransmission property is a transmit power of the transmission-adjustingwireless node based at least in part on a determination that thetransmission-adjusting wireless node is out of coverage of a basestation.
 7. The method of claim 1, wherein a plurality oftransmission-specific information relating to channel quality isreceived from a plurality of feedback-reporting wireless nodes, andwherein the adjusted transmission property is based at least in part ona lowest channel quality indicated in the plurality oftransmission-specific information.
 8. The method of claim 1, wherein aplurality of transmission-specific information relating to channelquality is received from a plurality of feedback-reporting wirelessnodes, and wherein the adjusted transmission property is based at leastin part on a most recurrent channel quality indicated in the pluralityof transmission-specific information.
 9. The method of claim 1, furthercomprising: transmitting a power headroom report (PHR) to thefeedback-reporting wireless node, wherein the transmission-specificinformation is based at least in part on the first communication and thePHR.
 10. The method of claim 9, wherein the transmission-specificinformation indicates that a modulation and coding scheme of thetransmission-adjusting wireless node is to be adjusted.
 11. The methodof claim 9, wherein the transmission-specific information indicates thata transmit power of the transmission-adjusting wireless node is to beadjusted.
 12. A transmission-adjusting wireless node for wirelesscommunication, comprising: a memory; and one or more processors coupledto the memory, the memory and the one or more processors configured to:transmit a first communication via a sidelink channel; receive, from afeedback-reporting wireless node, transmission-specific informationrelating to at least one of a channel quality of the sidelink channel ora power level for the transmission-adjusting wireless node, wherein thetransmission-specific information is based at least in part on the firstcommunication; adjust, based at least in part on thetransmission-specific information, a transmission property of thetransmission-adjusting wireless node to obtain an adjusted transmissionproperty; and transmit a second communication via the sidelink channelusing the adjusted transmission property.
 13. The transmission-adjustingwireless node of claim 12, wherein the transmission-specific informationrelates to at least one of a channel quality indicator of the sidelinkchannel or a transmit power control for the transmission-adjustingwireless node.
 14. The transmission-adjusting wireless node of claim 12,wherein the transmission-specific information is received withacknowledgment or negative-acknowledgment feedback of the firstcommunication from the feedback-reporting wireless node.
 15. Thetransmission-adjusting wireless node of claim 12, wherein the adjustedtransmission property is at least one of a modulation and coding schemeor a transmit power of the transmission-adjusting wireless node.
 16. Thetransmission-adjusting wireless node of claim 12, wherein the adjustedtransmission property is a modulation and coding scheme of thetransmission-adjusting wireless node based at least in part on adetermination that adjusting a transmit power of thetransmission-adjusting wireless node would cause thetransmission-adjusting wireless node to exceed an interference thresholdfor an access link to a base station serving the transmission-adjustingwireless node.
 17. The transmission-adjusting wireless node of claim 12,wherein the adjusted transmission property is a transmit power of thetransmission-adjusting wireless node based at least in part on adetermination that the transmission-adjusting wireless node is out ofcoverage of a base station.
 18. The transmission-adjusting wireless nodeof claim 12, wherein a plurality of transmission-specific informationrelating to channel quality is received from a plurality offeedback-reporting wireless nodes, and wherein the adjusted transmissionproperty is based at least in part on a lowest channel quality indicatedin the plurality of transmission-specific information.
 19. Thetransmission-adjusting wireless node of claim 12, wherein a plurality oftransmission-specific information relating to channel quality isreceived from a plurality of feedback-reporting wireless nodes, andwherein the adjusted transmission property is based at least in part ona most recurrent channel quality indicated in the plurality oftransmission-specific information.
 20. The transmission-adjustingwireless node of claim 12, wherein the one or more processors arefurther configured to: transmit a power headroom report (PHR) to thefeedback-reporting wireless node, wherein the transmission-specificinformation is based at least in part on the first communication and thePHR.
 21. The transmission-adjusting wireless node of claim 20, whereinthe transmission-specific information indicates that a modulation andcoding scheme of the transmission-adjusting wireless node is to beadjusted.
 22. The transmission-adjusting wireless node of claim 20,wherein the transmission-specific information indicates that a transmitpower of the transmission-adjusting wireless node is to be adjusted. 23.A non-transitory computer-readable medium storing one or moreinstructions for wireless communication, the one or more instructionscomprising: one or more instructions that, when executed by one or moreprocessors of a transmission-adjusting wireless node, cause the one ormore processors to: transmit a first communication via a sidelinkchannel; receive, from a feedback-reporting wireless node,transmission-specific information relating to at least one of a channelquality of the sidelink channel or a power level for thetransmission-adjusting wireless node, wherein the transmission-specificinformation is based at least in part on the first communication;adjust, based at least in part on the transmission-specific information,a transmission property of the transmission-adjusting wireless node toobtain an adjusted transmission property; and transmit a secondcommunication via the sidelink channel using the adjusted transmissionproperty.
 24. The non-transitory computer-readable medium of claim 23,wherein the transmission-specific information relates to at least one ofa channel quality indicator of the sidelink channel or a transmit powercontrol for the transmission-adjusting wireless node.
 25. Thenon-transitory computer-readable medium of claim 23, wherein thetransmission-specific information is received with acknowledgment ornegative-acknowledgment feedback of the first communication from thefeedback-reporting wireless node.
 26. The non-transitorycomputer-readable medium of claim 23, wherein the adjusted transmissionproperty is at least one of a modulation and coding scheme or a transmitpower of the transmission-adjusting wireless node.
 27. An apparatus forwireless communication, comprising: means for transmitting a firstcommunication via a sidelink channel; means for receiving, from afeedback-reporting wireless node, transmission-specific informationrelating to at least one of a channel quality of the sidelink channel ora power level for the apparatus, wherein the transmission-specificinformation is based at least in part on the first communication; meansfor adjusting, based at least in part on the transmission-specificinformation, a transmission property of the apparatus to obtain anadjusted transmission property; and means for transmitting a secondcommunication via the sidelink channel using the adjusted transmissionproperty.
 28. The apparatus of claim 27, wherein thetransmission-specific information relates to at least one of a channelquality indicator of the sidelink channel or a transmit power controlfor the apparatus.
 29. The apparatus of claim 27, wherein thetransmission-specific information is received with acknowledgment ornegative-acknowledgment feedback of the first communication from thefeedback-reporting wireless node.
 30. The apparatus of claim 27, whereinthe adjusted transmission property is at least one of a modulation andcoding scheme or a transmit power of the apparatus.